Westerbeke W-27 Service Manual

SERVICE STANDARDS
All measurements are in mm unless otherwise noted.
11 . hi' I 0393
o convert mm to mc es, mu tlply bv .
7
REPAIR (or
DESCRIPTION
MODELS STANDARD VALUE
replacement) REPLACEMENT
Required at:
Required at:
CAMSHAFT
Front bearing
A B
C
Lead bronze alloy with back metal
Oil clearance
A B
C
0.04 - 0.08
0.10 0.15
Cam lobe height (IN and EX)
A B
C
35.6 - 35.7
-1.0
PUMP CAMSHAFT
Front bearing A
B C
Ball bearing
Cam lobe height
A B C
44
-1.0
TAPPET
0.0.
A B
C
23
Tappet to cylinder block clearance
A B C .025 - .050
0.15
PUSH ROD
Bend
A B
C
Within 0.3
LUBRICATION
ENGINE OIL
Oil specification
API service classification
A B C
Class CF or CG-4
Viscosity
above 20°C A
B C
SAE30 or 10W-30
5° to 20°C A B
C
SAE20 or 10W-30
below 5°C A B
C
SAE 10W-30
OIL PUMP
Trochoid type
A B
C
Check valve opening pressure A B
C 4 ± 0.4 kg/cm
2
(at 500 rpm of pump speed)
Outer rotor to body clearance A B
C
0.15 - 0.2
0.3
Outer rotor to inner rotor clearance A B
C
0.05 0.12
0.25
Rotor to cover clearance A
B
C
0.03 - 0.07
0.20
OIL PRESSURE SWITCH
Contact closing pressure
Engine A B
C
4 - 6 psi normally open
Generator A B
C
4 - 6 psi normally open
FUEL SYSTEM
FUEL INJECTION PUMP
Model: NO-PFT4M A
B C
At smoke set (SS)
Pump speed
A C 1500 rpm: 27.5 ± 1.0 mm
3
/st
Pump speed
B 1500 rpm: 38 ± 1.0 mm
3
/st
At start set (MS)
Pump speed A
C 150 rpm: 34 ± 5 mm
3
/st
Pump speed B
150 rpm: 36 ± 7.5 mm
3
/st
Difference from reference cylinder
A B
C
Within 2 mm3/rev. cylinder
Prestroke
A B C
2.2 ± 0.1
NOZZLE
Throttle type A B
C
Model: NO-ON4S024
A B
C
Injection start pressure A B
C
120 ± 10 kg/cm
2
Engines & Generators
10

Westerbeke W-27 Specifications

General

Brand	Westerbeke
Model	W-27
Category	Engine
Language	English